/*
 * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The OpenAirInterface Software Alliance licenses this file to You under 
 * the Apache License, Version 2.0  (the "License"); you may not use this file
 * except in compliance with the License.  
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *-------------------------------------------------------------------------------
 * For more information about the OpenAirInterface (OAI) Software Alliance:
 *      contact@openairinterface.org
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>


#include "TLVEncoder.h"
#include "TLVDecoder.h"
#include "NetworkName.h"

int
decode_network_name (
  NetworkName * networkname,
  uint8_t iei,
  uint8_t * buffer,
  uint32_t len)
{
  int                                     decoded = 0;
  uint8_t                                 ielen = 0;
  int                                     decode_result;

  if (iei > 0) {
    CHECK_IEI_DECODER (iei, *buffer);
    decoded++;
  }

  ielen = *(buffer + decoded);
  decoded++;
  CHECK_LENGTH_DECODER (len - decoded, ielen);

  if (((*buffer >> 7) & 0x1) != 1) {
    errorCodeDecoder = TLV_VALUE_DOESNT_MATCH;
    return TLV_VALUE_DOESNT_MATCH;
  }

  networkname->codingscheme = (*(buffer + decoded) >> 5) & 0x7;
  networkname->addci = (*(buffer + decoded) >> 4) & 0x1;
  networkname->numberofsparebitsinlastoctet = (*(buffer + decoded) >> 1) & 0x7;

  if ((decode_result = decode_bstring (&networkname->textstring, ielen, buffer + decoded, len - decoded)) < 0)
    return decode_result;
  else
    decoded += decode_result;

#if NAS_DEBUG
  dump_network_name_xml (networkname, iei);
#endif
  return decoded;
}

int
encode_network_name (
  NetworkName * networkname,
  uint8_t iei,
  uint8_t * buffer,
  uint32_t len)
{
  uint8_t                                *lenPtr;
  uint32_t                                encoded = 0;
  int                                     encode_result;

  /*
   * Checking IEI and pointer
   */
  CHECK_PDU_POINTER_AND_LENGTH_ENCODER (buffer, NETWORK_NAME_MINIMUM_LENGTH, len);
#if NAS_DEBUG
  dump_network_name_xml (networkname, iei);
#endif

  if (iei > 0) {
    *buffer = iei;
    encoded++;
  }

  lenPtr = (buffer + encoded);
  encoded++;
  *(buffer + encoded) = 0x00 | (1 << 7) | ((networkname->codingscheme & 0x7) << 4) | ((networkname->addci & 0x1) << 3) | (networkname->numberofsparebitsinlastoctet & 0x7);
  encoded++;

  if ((encode_result = encode_bstring (networkname->textstring, buffer + encoded, len - encoded)) < 0)
    return encode_result;
  else
    encoded += encode_result;

  *lenPtr = encoded - 1 - ((iei > 0) ? 1 : 0);
  return encoded;
}

void
dump_network_name_xml (
  NetworkName * networkname,
  uint8_t iei)
{
  OAILOG_DEBUG (LOG_NAS, "<Network Name>\n");

  if (iei > 0)
    /*
     * Don't display IEI if = 0
     */
    OAILOG_DEBUG (LOG_NAS, "    <IEI>0x%X</IEI>\n", iei);

  OAILOG_DEBUG (LOG_NAS, "    <Coding scheme>%u</Coding scheme>\n", networkname->codingscheme);
  OAILOG_DEBUG (LOG_NAS, "    <Add CI>%u</Add CI>\n", networkname->addci);
  OAILOG_DEBUG (LOG_NAS, "    <Number of spare bits in last octet>%u</Number of spare bits in last octet>\n", networkname->numberofsparebitsinlastoctet);
  bstring b = dump_bstring_xml (networkname->textstring);
  OAILOG_DEBUG (LOG_NAS, "%s", bdata(b));
  bdestroy(b);
  OAILOG_DEBUG (LOG_NAS, "</Network Name>\n");
}
